Knob and Tube Wiring Removal & Replacement in Ottawa

Knob and tube wiring becomes dangerous when the insulation deteriorates, which typically happens after 80 to 100 years of use. Brittle insulation cracks and falls away, leaving bare copper wire exposed in wall cavities. The system has no grounding, so appliances and electronics have no protection against electrical faults. Two-prong outlets are a reliable indicator of ungrounded circuits. In Ottawa's older neighbourhoods like Westboro and Hintonburg, we regularly find knob and tube wiring with insulation so deteriorated that the copper is fully exposed. Modern homes are designed around grounded three-prong outlets. Knob and tube can't support this safely. If you're in a pre-war Ottawa home and you've never had the wiring inspected, contact us to arrange an assessment.

Most knob and tube wiring in Ottawa homes needs complete replacement. Partial replacement creates a mixed system where some circuits are grounded and others aren't, which complicates future electrical work. Many insurers in Ontario require full removal, not partial upgrades. Homes with knob and tube typically have 60-amp service, which can't handle modern electrical loads. Adding central air conditioning, electric vehicles, or multiple large appliances requires a panel upgrade to 200 amps. That upgrade is usually done at the same time as the rewiring. Pre-war homes in Centretown and the Glebe often have knob and tube on upper floors and upgraded wiring in the basement. We assess the entire system before recommending a scope of work.

Many insurers in Ontario will not cover homes with active knob and tube circuits. Others will insure the home but require written confirmation that the wiring will be replaced within 60 to 90 days of closing. Some insurers allow knob and tube wiring if it's been inspected by a licensed electrician and deemed safe, but this is less common. If you're buying a home in Ottawa with knob and tube wiring, contact your insurer before finalising the purchase. We can inspect the system and provide documentation showing what needs to be replaced and what the work will cost. Most buyers in older Ottawa neighbourhoods budget for full rewiring if knob and tube is present. Contact us to arrange an assessment and receive written documentation for your insurer.

Most full knob and tube removals in Ottawa take three to five days depending on home size and complexity. A typical 1,200 square foot bungalow with knob and tube on both floors takes four days. Larger homes or homes with difficult attic access take longer. The work involves opening walls and ceilings to access old wiring, removing it completely, installing new grounded circuits, upgrading the panel, and patching drywall or plaster. Hydro Ottawa disconnects power at the meter during the panel upgrade, which typically takes six to eight hours. Power is restored the same day. We tell you the expected duration before starting the job. If an ESA inspection is required, we schedule it after the work is complete and before final payment.

Two-prong outlets throughout the home are the most visible sign of knob and tube wiring. Other signs include frequently tripped breakers, flickering lights, outlets that feel warm to the touch, and a burning smell near outlets or switches. In Ottawa's older homes, knob and tube wiring is often found in attics and upper floors where it's been undisturbed for decades. Homes built before 1950 in Vanier, Manor Park, and Old Ottawa South often have knob and tube wiring still in use. If you're unsure whether your home has knob and tube wiring, check the attic. Porcelain knobs and tubes supporting single insulated wires are easy to spot. If you see them, contact us to arrange a full assessment.

Knob and tube wiring can't be repaired in a way that makes it safe for long-term use. The insulation is brittle and deteriorated, and the system has no grounding. Patching one circuit doesn't address the underlying problem. Most insurers in Ontario require full replacement, not repairs. In Ottawa, we occasionally see homeowners who've had individual circuits replaced while leaving the rest of the knob and tube wiring in place. This creates a mixed system that complicates future electrical work and doesn't satisfy insurer requirements. If you're dealing with knob and tube wiring, plan for full removal and rewiring. We give you a written price after assessing the job, before any work starts.

Complete knob and tube removal in Ottawa typically costs between eight thousand and twelve thousand dollars for a standard home. A 1,200 square foot bungalow with knob and tube on both floors usually runs around ten thousand dollars all in. Cost depends on home size, how much wiring needs to be replaced, the condition of walls and ceilings, and whether the panel needs upgrading. Homes in Westboro and Hintonburg with plaster walls take longer to patch than homes with drywall, which affects labour cost. The price includes removing all old wiring, installing new grounded circuits, upgrading the panel to 200 amps, installing a grounding system, and patching walls and ceilings. We give you a written price after assessing the job, before any work starts.

If a permit is needed, we handle the paperwork and scheduling. You don't need to contact anyone or track deadlines. Our electricians work under ECRA/ESA licence #7018741, which authorises this type of work in Ontario. The ESA inspects electrical work after completion to confirm it meets current code. We schedule the inspection, address any findings, and provide you with the signed-off documentation. Most knob and tube removals in Ottawa pass inspection on the first visit. If your insurer requires written confirmation that the work has been completed and inspected, we provide that documentation after the ESA signs off.